foible
Definitions
A minor weakness or eccentricity in someone's character.
The part of a sword blade between the middle and the point, which is the weakest part.
Examples
While he was a brilliant scientist, his tendency to talk to his plants was a harmless foible.
We all have our little foibles, but hers was an obsession with organizing her books by color.
The director's only foible was his insistence on filming every scene at sunrise.
Synonyms
weakness failing shortcoming quirk idiosyncrasy imperfection fault